The makers of Tylenol are voluntarily recalling more than 20 children's and infant's liquid products after bacteria was found in an "inactive ingredient" in products manufactured between April and June 2008.

McNeil Consumer Healthcare, which makes Tylenol, initiated the recall of "select lots" of the products after consulting with the U.S. Food and Drug Administration.

The recall was done on a warehouse and retail level, but products already packaged and on store shelves have "met all specifications," according to a statement by Tylenol. No bacteria has been found in any of the finished products, Tylenol said.